820-01949 Faulty CD3215 or ROM chip

[Kappy]

I have an 820-01949 which has been to another shop for a failed repair. Its a 4 USB port MacBook and strangely I'm getting 20v and some current (0.40A before going back to 0A) and on the other side, i'm getting 5v 0.24A constant and on the other 5v 0.24v boot loop.

Could this be the CD3215 which isn't boot looping or as there is a current on the 5v port, be the ROM?

Thanks

 

[2informaticos]

We have several recent threads on the forum with mention about bad "new" CD3215 chips.
People changed 2-3 chips until found a good one.

Not getting proper replacement is a big problem on our work.
If machine still stuck on 5V, we waste a lot of time searching on other places, assuming CD3215 was replaced correctly.

 

[Kappy]

I've not replaced anything yet and the previous shop only ultrasonic it. I don't want to go down the hole of changing the CD3215's when it could be the ROM which is at fault. So from your expertise knowledge do you think it's the CD3215's (on the 5v non-boot loop) or the ROM. Taking into account that I'm getting 20v on the other 2 cd3215's and 0.24A on the 5v on the other 2.

 

[2informaticos]

Seems that T2 can talk with all CD3215 chips; if switches to 20V one side.
Both TBT ROMs should be good in such case.

You may have problems on the input side of one CD3215.
Compare diode mode readings around CD3215 chips left/right.